updated setup/python workflow to use python 3.12

Author: rongxin-liu

.github/workflows/main.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.12'
 
       - name: Build for linux/amd64
         uses: docker/build-push-action@v5
@@ -56,7 +56,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.11'
+          python-version: '3.12'
 
       - name: Build for linux/arm64
         uses: docker/build-push-action@v5